Most grocery store butcher counters would be able to order some for you if you ask, but they're unlikely to have any on hand if customers aren't already buying

Most grocery store butcher counters would be able to order some for you if you ask, but they're unlikely to have any on hand if customers aren't already buying it off the shelves. In a lot of the US, people who would want mutton are already going to specialty shops to pick up meat and imports; where I live (in northern Virginia), there are a couple of halal butcher shops within walking distance that always stock lamb and mutton, and the grocery stores in the same area might stock lamb (usually French cuts) but never carry mutton or goat.